Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 255
time that pupils are leav-ing school in the afternoon. Another application of the same principle is seen in amethod often taken for measuring the height of a tree. The observer has a large right trianglemade of wood. Such a triangle is shown inthe picture, in which AB = B C. He holds A Blevel and… … 1. What is theheight of the tree in the picture if the «*U*«*^*^ «**•&«*triangle is 5 ft. 4 in. from the ground, and AD is 23 ft. 8 in.? 2. Suppose a triangle is used which has AB = twice BC.What is the height if AD = 75 ft.? LEADING PROPOSITIONS OF BOOK III 245 There are many variations of…
Geometry
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